Value Mixture #5 - 2 variables

Youtube videos by Julie Harland are organized at http://YourMathGal.com. Solves this value mixture problem using 2 variables: A store sells columbian coffee for $4 per pound and french coffee for $7 per pound. They decide to make a 120 pound blend and sell it for $5 a pound. How many pounds of each type of coffee should be used?
valmix2var-5.mp4<br />For more great math videos visit: www.youtube.com/user/videosbyjulieharland/videos